Relay



A. H. CANIJ EE AND L, J. HIEBARU.

RELAY.

APPLICATION FILED we. 1. 12m.

1 328,837, PatentedSept. 12, 1922.

' VINVENTOR5 Andrew lifaodce & Lg yd J H/Ma/ d I I I Patented Sept. 12, 1922.

1 UNITED STATES PATENT. OFFICE. 1

ANDREW n. CANDEE, or PITTSBURGH, AND LLoYnJ. HIBBARD, or wrnxnvsnune;

PENNSYLVANIA, ASSIGNORS TO WESTINGHOUSEELECTRIC AND ING COMPANY, A oonronnrron on PENNSYLVANIA.

MANUFACTUR- RELAY.

Application filed August 7, 1917. Serial No. 184,804.

T 0 all whom it may concern Be it known that W8,'ANDREW H. OANDEE,

a citizen of the United States, and a resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, and LLOYD J. HIBBARD, a citizen of the United States, and a resident of Wilkinsburg, in the county of Allegheny and State of Pennsylvania,.have invented a newvand useful Improvement in Relays-of which the following is a specification. I

Our invention relates to relays and parti cularly to protective devices and systems for electric railway vehicles.

One object of our invention is to provide means that shall be adapted to automatically' control the energization of an electro1'esponsive device to preclude its operation under predetermined conditions and to insure its operation under other predetermined conditions.

Another object of our invention is toprovide a relay of the above-indicated character that shall be adapted to effect disengage ment of one pair of contact members when it is operated and engagement of another pair of contact members-only when itis returned to its initial position after being operated. j a

A further object of our invention is to pro. vide a relay for a system of the above-v indicated character that shall 'beinexpen sive to construct and effective in its operation. 1 V

In practicing our invention We provide a pantograph' lowering Ielectromagnet, a switch for manually controlhng the c1rcu1t lowered under these conditions and to pro vide an independent circuit for theeleotromagnet afterthe overload is removed to insure the loweringofthe pantograph,'-irreispective of the position of the switch.

Figure 1 ol the accompanying drawing-is a diagrammatic view of a pantograph-lowering device for an-electricvehicle embodyingour invention, Fig. 2 is afragmentary view of the device shown in Fig.1, illustrating one of its operative positions, and

Fig. 8 is a viewtaken along the line III-- III of Fig. 1.

A pantograph v1 is operatively I connected" to atrolley conductor 2 and is adapted to supply energy to the primary winding 3 of atransformer 4, the-secondary winding 5 of which is adapted to be connected to the motors (not shown) of an. electric vehicle.

An electromagnet'G is adapted to lower the pantograph 1 and is providedwith amanually operated switch 7 andwith acrelay 8 for controlling the circu-itthereof. i

- The relay 8'is mounted ona panel board 9 and comprises a frame 10 having a magnetizable core portion 11 around which is disposed a winding 12.. A rod.13 extends through an opening 14 in the core portion 1.1 and ihas'two bridging contact members 15 and 16 mounted thereon. All armature 1'? is pivotally mountedon' apin 18onthe frame 10 and is adapted to engage the lower end'19 of the rod'13 When it is attracted by reason of the proper Jenergiz'ation of. the

winding 12. 'Thefrodl isguided by-Ia pro jection 20'on the frame 10, and springs 21 and 22 are provided for returningthe rod 13 to its initial position under predetermined conditions. A scale plate 23' is provided for cooperation with a pointer 2i, at one end of the armature 17 toindicate the current setting oftherelay, andan adjusting screw 25 is provided for'adjusting the initial position of the armature 17.

The, bridging contact member 15 is adapted to normally engage. two stationary contact members .26 and 27 andthe bridging contact member 16 is adapted to normally engage the arms 28 and 29 of contact devices 30 and 81. The contact device 30 comprises the arm 28 and an arm 32 which are pivotally mounted on a pin 38-.

The arm 28 isprovid'edwith an insulating member 34 that normally engages thebridging' contact member 16. A spring 35 is adapted to normally retain the insulating piece 34. in engagement with the bridging contact member 16, and a latchj36 isprovided to engage the arm 32 when the contact device. 30 is raisedI-by reason of the movement of the rod 13. The contact device 31 comprises. the arm 29, upon. whlclris mounted an insulatingjmember '37, and an arm. 38 which are pivotally mounted on a pin A spring il-(l is adapted to hold the insulating piece 37 in engagement with. the bridging contact member 16, and a latch 11 is provided to engage the arm 38 when the contact device 31 is moved upwardly by reason of the operation of the rod 18.

The winding 12 is operatively connected to the secondary winding 12 of a series transformer 13 the primary winding 4-1 of which is connected in series with the primary winding 3 of the main transformer at. One terminal of the winding of the electromagnet 6 is connected to the stationary contact member 2-6 and to the contact device 3 The other terminal of the winding oi the electromagnet 6 is connected to one terminal of the source 415 of electromotive force, the other terminal of which is connected to the adjusting screw 25 and to one terminal of the switch 7. The other terminal of the switch 7 is connected to the stationary contact member 27. The adjusting screw is insulated from the frame 10 which is electrically connected to the contact device 31.

Under normal conditions in the vehicle being protected, if it is desired to lower the pantograph 1, the switch 7 is closed and the circuit is completed from the source 15 of electromotive force through the switch 7, contact members 26, 27 and 15 and the winding of the electro-magnet 6. \Vhen an overload or short circuit obtains on the vehicle, it is not advisable to lower the pantograph because it will be required to constitute an interrupter of relatively large currents when it is disengaged from the trolley conductor. However, it an overload or a short circuit obtains on the vehicle, the winding 12 will be sutliciently energized to cause the armature 17 to move upwardly, and such move ment will effect disengagement oi the bridg ing contact member 15 and the stationary contact members 26 and 27, thereby ogeining the circuit through the winding of the electromagnet 6. The upward movement 01 the rod 13 causes the bridging contact member 16 to turn the contact devices 30 and 31 about the pins 33 and 39 until the arniis 32 and 38 thereof are latched. in their upper positions by the latches 36 and 11, respectively.

If the overload is removed from the eircuit, the armature 17 will drop into engagement with the adjusting screw 25, and the bridging contact member 16 will drop into engagement with the arms 32 and 38 of the contact devices 30 and 31, respectively. This will cause a circuit to be completed from one terminal of the source 4-5 of electromotive force through the adjusting screw 25, armature 17, frame 10, arm 38 of the contact device 31, bridging contact member 16, arm 33 of the contactdevice 80 and the winding of the electromagnet (3 to the other terminal 01" the source l5 of electromotive :torce. Thus, a closed circuit will be established in shunt to the switch 7 and contact members 26, 15 and 2 :3 to thereby elfect lowering of the pantograph 1, irrespective of the position in which the switch 7 is, under these conditions.

In order to reset the relay 8, the latches 5-36 and 411 may be depressed. to permit the springs 35 and 10 to return the contact devices 30 and 31 to their initial positions and the springs 21 and 22 to move the bridging contact member 15 into engagement with the stationary contact members 26 and 27.

o do not limit our invention to the particular term of relay shown, as various modi lications may be made therein without dcparting from the spirit and scope olf the invention as set forth in the appended claims.

lVe claim as our invention:

1. A relay comprising a movable member, two bridging contact members mounted thereon, co-operating contact members tor the bridging members, means ifor actmrting the movable member to disengage onlv one bridging member trom its ell-operating contact members, and means for eli'ecting the engagement of the other bridging member with its co-operating cm'itact members when the movable member is released by the actuating means.

2. A relay comprising a 'n'iovable member. two sets of contact members actuated thereby, means for actuating the movable mcniber to el'li'ect disengagement o'l one set of contact members, and means tor cit'ecting the engagement of the other set only when the movable member moves toward its initial position.

it relay comprising a. movable member, a normally engaged contact device, a nor mally disengaged contact device, means :lor actuating the movable member to disenga the .i'iormally engaged contact device and means for ellecting the engagen'ient of the other contact device only when the movable member moves toward its initial position.

4. A. relay comprising a movable member, a stationary contact men'iber, a pivotally mounted. contact member, two contact members mounted on the movable members for engaging the said. stationary and pivotally mounted contact members, means for actuating the movable member to ei'l'ect disengagement of one of the movable memltiers and the stationary contact member and to move the pivotally mounted contact member to another position, and means for maintaining the pivotally-mounted contact members in said position to engage the other movable contact member when the movable member moves towards its initial position.

5. A relay comprising a movable member, a pivotally mounted member having a contact portion thereon, a contact member mounted on the movable member, means for actuating the movable member to cause the movable contact member to actuate the pivotally mounted member, and means for holding the pivotally mounted member to engage the movable contact member only when the movable member moves toward its initial position.

6. A relay comprising a movable contact member, a movable member having a contact portion thereon, means for so moving the movable contact member that it shall actuate the movable member having the contact por tion thereon, and means for holding the said movable member having the contact portion thereon in its actuated position to effect engagement between the movable contact member and the contact portion when the movable contact member moves toward its initial position.

7. A relay comprising a movable contact member, a movable member having a contact portion thereon, means for so moving the movable contact member that it shall actuate the movable member having the contact portion thereon, and means for holding the said movable member having the contact portion thereon in its actuated position to effect engagement between the movable contact member and the contact portion only when the movable contact member moves toward its initial position.

8. A relay comprising a movable contact member, a second movable member having a contact portion thereon, means for so moving the movable contact member that it shall actuate the second movable member, and a latch for retaining the second movable member in its actuated position to effect engagement between its contact portion and the movable contact member only under predetermined conditions.

9. A relay comprising a movable contact member, a second movable member having a contact portion thereon, means for so moving the movable contact member that it shall actuate the second movable member, and a latch for retaining the second movable member in its actuated position to effect engagement between its contact portion and the movable contact member only when said movable member moves toward its initial position.

10. In an electric circuit, the combination with an electro-responsive device, energizing means therefor and a switch for controlling the circuit thereof, of a relay energized from the circuit for rendering the switch ineffective when an overload obtains on the circuit and for automatically energizing the electroresponsive device when the overload is removed i'rom the circuit.

11. In an electric circuit, the combination with an electromagnet, a control source of electromotive force and a switch for connecting the electromagnet in circuit with the control source of electromotive force, of a relay energized from the main circuit for opening the circuit through the switch when switch when an overload obtains on the main circuit and for completing an auxiliary con trol circuit in shunt relation to the switch when the overloadis removed from the main circuit.

In testimony whereof, we have hereunto subszcribed our names this 17th day of July, 191

ANDREW H. GANDEE. LLOYD J. HIBBARD. 

